package net.diaowen.common.plugs.zxing;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

/**
 * Created by keyuan on 2018/9/8.
 */
public class ZxingUtil {

    public static int flag= 0;

    // 图片宽度的一般
    private static final int IMAGE_WIDTH = 31;
    private static final int IMAGE_HEIGHT = 31;
    private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2;
    private static final int FRAME_WIDTH = 2;

    // 二维码写码器
    private static MultiFormatWriter mutiWriter = new MultiFormatWriter();


    public static BufferedImage qRCodeCommon(String content, String imgType, int size){
        int imgSize = 67 + 12 * (size - 1);
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 2);
        try{
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, imgSize, imgSize, hints);
            return MatrixToImageWriter.toBufferedImage(bitMatrix);
        }catch (WriterException e){
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 得到BufferedImage
     *
     * @param content
     *            二维码显示的文本
     * @param size
     *            二维码的宽度
     * @param srcImagePath
     *            中间嵌套的图片
     * @return
     * @throws WriterException
     * @throws IOException
     */
    public static BufferedImage genBarcode(String content, int size ,String srcImagePath) throws WriterException,
            IOException {

        int width = 67 + 12 * (size - 1);
        int height =67 + 12 * (size - 1);

        // 读取源图像
        BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH,
                IMAGE_HEIGHT, false);

        int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT];
        for (int i = 0; i < scaleImage.getWidth(); i++) {
            for (int j = 0; j < scaleImage.getHeight(); j++) {
                srcPixels[i][j] = scaleImage.getRGB(i, j);
            }
        }

        java.util.Hashtable hint = new java.util.Hashtable();
        hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 生成二维码
        BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE,
                width, height, hint);

        // 二维矩阵转为一维像素数组
        int halfW = matrix.getWidth() / 2;
        int halfH = matrix.getHeight() / 2;
        int[] pixels = new int[width * height];

        // System.out.println(matrix.getHeight());
        for (int y = 0; y < matrix.getHeight(); y++) {
            for (int x = 0; x < matrix.getWidth(); x++) {
                // 读取图片
                if (x > halfW - IMAGE_HALF_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH
                        && y < halfH + IMAGE_HALF_WIDTH) {
                    pixels[y * width + x] = srcPixels[x - halfW
                            + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH];
                }
                // 在图片四周形成边框
                else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        - IMAGE_HALF_WIDTH + FRAME_WIDTH)
                        || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH
                        && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH
                        && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH
                        + IMAGE_HALF_WIDTH + FRAME_WIDTH)) {
                    pixels[y * width + x] = 0xfffffff;
                } else {
                    // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
                    pixels[y * width + x] = matrix.get(x, y) ? 0xff000000
                            : 0xfffffff;
                }
            }
        }

        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        image.getRaster().setDataElements(0, 0, width, height, pixels);

        return image;
    }

    /**
     * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标
     *
     * @param srcImageFile
     *            源文件地址
     * @param height
     *            目标高度
     * @param width
     *            目标宽度
     * @param hasFiller
     *            比例不对时是否需要补白：true为补白; false为不补白;
     * @throws IOException
     */
    private static BufferedImage scale(String srcImageFile, int height,
                                       int width, boolean hasFiller) throws IOException {
        double ratio = 0.0; // 缩放比例
        File file = new File(srcImageFile);
        BufferedImage srcImage = ImageIO.read(file);
        Image destImage = srcImage.getScaledInstance(width, height,
                BufferedImage.SCALE_SMOOTH);
        // 计算比例
        if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) {
            if (srcImage.getHeight() > srcImage.getWidth()) {
                ratio = (new Integer(height)).doubleValue()
                        / srcImage.getHeight();
            } else {
                ratio = (new Integer(width)).doubleValue()
                        / srcImage.getWidth();
            }
            AffineTransformOp op = new AffineTransformOp(AffineTransform
                    .getScaleInstance(ratio, ratio), null);
            destImage = op.filter(srcImage, null);
        }
        if (hasFiller) {// 补白
            BufferedImage image = new BufferedImage(width, height,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D graphic = image.createGraphics();
            graphic.setColor(Color.white);
            graphic.fillRect(0, 0, width, height);
            if (width == destImage.getWidth(null))
                graphic.drawImage(destImage, 0, (height - destImage
                                .getHeight(null)) / 2, destImage.getWidth(null),
                        destImage.getHeight(null), Color.white, null);
            else
                graphic.drawImage(destImage,
                        (width - destImage.getWidth(null)) / 2, 0, destImage
                                .getWidth(null), destImage.getHeight(null),
                        Color.white, null);
            graphic.dispose();
            destImage = image;
        }
        return (BufferedImage) destImage;
    }

    /**
     *
     * @param content
     *            二维码显示的文本
     * @param size
     *            二维码的宽度     *
     * @param srcImagePath
     *            中间嵌套的图片
     * @param destImagePath
     *            二维码生成的地址
     */
    public static void encode(String content, int size,
                              String srcImagePath, String destImagePath) {
        try {
            // ImageIO.write 参数 1、BufferedImage 2、输出的格式 3、输出的文件
            ImageIO.write(genBarcode(content, size, srcImagePath),
                    "jpg", new File(destImagePath));

        } catch (IOException e) {
            e.printStackTrace();
        } catch (WriterException e) {
            e.printStackTrace();
        }
    }


    public static void main(String[] args) {
        try {
            System.out.println("+++++++++++++++++");
            int i=0;

            while(flag==0) {
                System.out.println("+++++++++++++++++flag=0"+flag);
                Thread.currentThread().sleep(1000);
                if(i==20){
                    flag=1;

                }
                i++;
            }
            System.out.println("-------------------"+flag);
        }catch(Exception e){
            e.printStackTrace();
        }
    }




}
